Realign code with the 2026-07-30 findings-resolution rulings

Delete Immediately is removed entirely (ruling ae1dd96, Redesign card
d40bfac1): the delete vocabulary is purely staged — board → trash,
trash → permanent (confirmed on no-git boards), Empty Trash for bulk.
Gone: File ▸ Delete Immediately (⌥⌘⌫) and its validation, both
⌥-alternate context rows (card + the permanently-disabled lane row),
the VO custom action, BoardStore.deleteImmediately,
TrashModel.canDeleteImmediately, TrashConfirmations' .purge action
(zero surviving callers — trash-side Delete always used
.deleteTrashCards), and the pinning tests. purgePrompt drops its
now-single-purpose container parameter (.trash is the only surviving
caller). BoardWriter.purgeItem survives — create-undo rollback still
needs it — with its comment rewritten. README's trash paragraph drops
the ⌥⌘⌫ sentence.

The other 2026-07-30 rulings (2ec2c95 registry freshness stamp,
c741b02 unified-log-as-coerce-consumer) required no code changes —
already conformant.

Both schemes 1844 tests / 318 suites green.

Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY

Kanban/History/BoardStoreHistory.swift

@@ -160,8 +160,8 @@ extension BoardStore {
     /// **Removal, not a move into the trash**, exactly as 13 words it: an undone create leaves *no
     /// trace*, because the item was born of the gesture being undone — filing it in the trash would
     /// leave a card the user never really made for them to find. `purgeIsUnrecoverable` is untouched
-    /// by this: that flag is about Delete Immediately, whose loss is the user's own final gesture,
-    /// while this loss is one ⇧⌘Z away.
+    /// by this: that flag is about the trash's own permanent delete, whose loss is the user's own
+    /// final gesture, while this loss is one ⇧⌘Z away.
     ///
     /// The honest edge, recorded rather than papered over: anything that happened *inside* the
     /// created folder through an operation that registers no step of its own — an attachment added by